Hi Krzysztof,
Sorry for the delayed response.
We have confirmed this issue “Issue in rendering records in firefox while using remote data with unobtrusive library” as bug. Thank you for the taking the time to report the issue and helping us improve our product. At Syncfusion we are committed to fixing all the validated defect (subject to technological feasibility and Product Development Life Cycle) and including its fix in our subsequent release. The fix for the issue will be included in our first week patch release after volume 2 2020 main release which is expected to be rolled out on 1st week of July 2020.
You can track the current status of your request, review the resolution timeline and contact us for any further inquiries through this link.
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Please get back to us if you need any further assistance.
Regards,
Manivannan Padmanaban