Gold paywalls on my FREE comic?

HI, im making a web comic. and i've specified that my comic must always be free and nothing but free. and up until like a week ago, this was the case.
however, since the new update to the page, readers (i've tested this myself) are getting paywalled by a gold subscription ad. you can just go to the next page and continue reading obviously.

but new readers might think that my shit is paywalled when it is NOT. is this a bug? or just agressive marketing?