Thanks for joining our community and helping improve Syncfusion products!
In Schedule month view we performed delete action for longer appointments the delete alert is behaves wrongly.
Step 1: Open the sample.
Step 2: Select the event with the subject name of "Test appointment".
Step 3: Close the quickInfo popup.
Step 4: Now click the delete button.
Step 5: Note the delete alert show as "Delete Multiple Events".