Kit sample ino seems to be stuck in back memory

First and second stage testing of an arduino kit with projects went OK, successfully corrected servo code to make it work as expected, but third testing ignored ino file changes and just repeated the original, incorrect, sketch! I have the impression that the board accumulated testing sketches, did not reset (manually), and does not accept new sketches despite IDE reporting it is all OK!

Or in other words, there was no tabula rasa, now the memory has been fixed and cannot be changed. Am I right or wrong? Is it possible? I undestand the board can be reset to NULL and reloaded with compiled sketches indefinitely. :%

I need to be certain ASAP since I am in the warrant time and may be able to get a replacement should the board was factory-faulty or used. 8)

The board does not accumulate sketches. Each new one replaces the previous. You can upload 10,000 sketches to flash before it starts to wear out.