It could well be from a bad batch, or it could have been stored in inappropriate conditions before sale to you.

Because tape use is a tiny fraction of what it once was, the whole production process has been scaled back and there is a greater variation between batches as a result. Also, tape is stored for much longer before sale and use, which can also affect its condition.

But the guys are right -- have a discussion with your retailer to explain the problem and organise replacements.