Problem with charging limits not respected

Normal. And it will also from time to time charge to 100%.

Read this --> About Charge Limit and Optimized Battery Charging on iPhone - Apple Support

In the link is the following statement:

Your iPhone will charge to within a few percentage points of your chosen limit and then stop charging. If the battery charge level drops more than 5 percent while connected to power, charging will resume, again charging to within a few points of your chosen limit.

Apple also notes that the battery will charge to 100% "occasionally" to help with proper battery calibration. You may find that "occasionally" can range from several times a month to once a month or more.

Perfectly normal.