It did that to me too for like 2 weeks(back button), you have to press it 3 times once the page is loaded lol. Just went away one day & now it's normal.

I use tweezers also, easier for me than toothpicks or whatnot. You have to be more careful though. I took one of the cotyledons off once with the shell and the plant survived until I accidentally gave it full veg nutes after only 3 days from germination (LABEL YOUR WATER!). If using tweezers you just want to grab the shell from the top & bottom next to the stem and press gently until the shell cracks, then you can pry it off and pray your plant survives.