If the erase tool, namely the ERASE Command, works correctly, as well as by clicking on the ERASE icon from the Home Ribbon and you only have problems with the DELETE key on your keyboard, there is a chance that You have defined a shortcut for it. In this case, this problem will occur for all drawing files in this version of software you have on your computer, you can fix the unwanted changes that may have been made by resetting the program to its default settings.
+WIN START MENU --> AUTOCAD --> reset setting to default.
But I have a better suggestion for you if of course the ERASE command works correctly, so it is best to use a shortcut key, the (E) Command, for less regular use and less use of the right hand.
If this description helps you please press the Accept Solution button.
MeHrDaD RaHiMi
AutoCAD Certified Professional
Revit Architecture Certified Professional
Revit Structure Certified Professional
Please select the Accept as Solution button if my post solves your issue or answers your question.