Unfortunately, it is not uncommon.
The usual reason is to save money but it depends what the change is.
If your needles are shorter, this change is due to aligning with common practice. Most people find shorter (usually 4mm) needles better.
If your needles are a different make, this is to save money. Some people are fine with the cheaper brands. Others find they don’t “glide” in as easy which is uncomfortable (and maybe painful). If this is the case for you, I would recommend discussing with your GP and, if different, you Diabetes team.