Confused...what's with these lines?

I'm 16 dpo today, and have been getting positives since 10 dpo, but yesterday morning my test was lighter than the day before. I thought for sure it was a chemical. I of course ran out of the easy @ home tests so I couldn't retest this morning with that one. But I did also take a pregmate yesterday morning, last night and this morning, and now I'm just confused. The line looks about the same as yesterday morning. Here is the pregmate test progression. Bottom is yesterday morning, middle is last night, and top is this morning.

Here is the line progression from the easy@home. Top is yesterday, and the one before that is the day before. You can see yesterday morning is much lighter. I ordered more of these but no clue when they'll get here, so now I'm just waiting. Could this be a chemical?