Has anybody else got indents on pregmate brand

Olivia

Going a little crazy here lol. The first one I took tonight the second one was last night the one from last night is pretty dark and in person it looked like it had color. The one tonight is less dark almost non existent. The fmu test from this morning was negative. Are indents common in this brand? I've personally went through most of the pack (50) and this is the first time I've encountered it.