18 year old 6’4’’ male stuck at 181 lbs.

I’ve been eating at 21 times my bodyweight and gained about 1.5 lbs per week so far, but I’ve been stuck at this weight for two weeks now, it actually went down a little.

How do I deal with this? Just keep bulking and hope I will eventually overcome that hurdle naturally?

Also, any idea why this happens? I weigh myself at the same time every time, right after taking a pee in the morning, did I just choose two unfortunate days to weigh myself?