I'm upgrading to the latest version of Angular and Syncfusion and the problem still persists : Sorting by StartDate and then Indenting duplicates all actions.
{
"name": "psqydj--run",
"version": "0.0.0",
"private": true,
"dependencies": {
"@angular/animations": "10.2.1",
"@angular/common": "10.2.1",
"@angular/compiler": "10.2.1",
"@angular/core": "10.2.1",
"@angular/forms": "10.2.1",
"@angular/http": "7.2.16",
"@angular/platform-browser": "10.2.1",
"@angular/platform-browser-dynamic": "10.2.1",
"@angular/router": "10.2.1",
"@syncfusion/ej2-angular-base": "18.3.44",
"@syncfusion/ej2-angular-buttons": "18.3.40",
"@syncfusion/ej2-angular-calendars": "18.3.42",
"@syncfusion/ej2-angular-charts": "18.3.44",
"@syncfusion/ej2-angular-circulargauge": "18.3.44",
"@syncfusion/ej2-angular-diagrams": "18.3.44",
"@syncfusion/ej2-angular-documenteditor": "18.3.44",
"@syncfusion/ej2-angular-dropdowns": "18.3.44",
"@syncfusion/ej2-angular-gantt": "^18.3.42",
"@syncfusion/ej2-angular-grids": "18.3.44",
"@syncfusion/ej2-angular-heatmap": "18.3.35",
"@syncfusion/ej2-angular-inputs": "18.3.44",
"@syncfusion/ej2-angular-layouts": "18.3.44",
"@syncfusion/ej2-angular-lineargauge": "18.3.35",
"@syncfusion/ej2-angular-lists": "18.3.44",
"@syncfusion/ej2-angular-maps": "18.3.44",
"@syncfusion/ej2-angular-navigations": "18.3.44",
"@syncfusion/ej2-angular-notifications": "18.3.35",
"@syncfusion/ej2-angular-pivotview": "18.3.44",
"@syncfusion/ej2-angular-popups": "18.3.35",
"@syncfusion/ej2-angular-richtexteditor": "18.3.44",
"@syncfusion/ej2-angular-schedule": "18.3.44",
"@syncfusion/ej2-angular-splitbuttons": "18.3.40",
"@syncfusion/ej2-angular-treemap": "18.3.35",
"@syncfusion/ej2-base": "18.3.44",
"@syncfusion/ej2-buttons": "18.3.40",
"@syncfusion/ej2-calendars": "18.3.42",
"@syncfusion/ej2-charts": "18.3.44",
"@syncfusion/ej2-circulargauge": "18.3.44",
"@syncfusion/ej2-compression": "18.3.35",
"@syncfusion/ej2-data": "18.3.42",
"@syncfusion/ej2-diagrams": "18.3.44",
"@syncfusion/ej2-documenteditor": "18.3.44",
"@syncfusion/ej2-dropdowns": "18.3.44",
"@syncfusion/ej2-excel-export": "18.3.35",
"@syncfusion/ej2-file-utils": "18.3.35",
"@syncfusion/ej2-grids": "18.3.44",
"@syncfusion/ej2-heatmap": "18.3.35",
"@syncfusion/ej2-inputs": "18.3.44",
"@syncfusion/ej2-layouts": "18.3.44",
"@syncfusion/ej2-lineargauge": "18.3.35",
"@syncfusion/ej2-lists": "18.3.44",
"@syncfusion/ej2-maps": "18.3.44",
"@syncfusion/ej2-navigations": "18.3.44",
"@syncfusion/ej2-notifications": "18.3.35",
"@syncfusion/ej2-pdf-export": "18.3.35",
"@syncfusion/ej2-pivotview": "18.3.44",
"@syncfusion/ej2-popups": "18.3.35",
"@syncfusion/ej2-richtexteditor": "18.3.44",
"@syncfusion/ej2-schedule": "18.3.44",
"@syncfusion/ej2-splitbuttons": "18.3.40",
"@syncfusion/ej2-svg-base": "18.3.35",
"@syncfusion/ej2-treemap": "18.3.35",
"core-js": "2.6.9",
"rxjs": "6.6.3",
"rxjs-compat": "6.6.3",
"tslib": "^2.0.3",
"zone.js": "0.10.3"
},
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
},
"devDependencies": {
"@angular-devkit/build-angular": "~0.1002.0",
"@angular/cli": "~10.2.0",
"@angular/compiler-cli": "~10.2.1",
"@angular/language-service": "~10.2.1",
"@types/node": "^12.11.1",
"@types/jasmine": "~3.5.0",
"@types/jasminewd2": "~2.0.3",
"codelyzer": "^5.1.2",
"jasmine-core": "~3.5.0",
"jasmine-spec-reporter": "~5.0.0",
"karma": "~5.0.0",
"karma-chrome-launcher": "~3.1.0",
"karma-coverage-istanbul-reporter": "~3.0.2",
"karma-jasmine": "~4.0.0",
"karma-jasmine-html-reporter": "^1.5.0",
"protractor": "~7.0.0",
"ts-node": "~8.3.0",
"tslint": "~6.1.0",
"typescript": "~4.0.5"
}
}