Any insights on what's causing this issue

I also see your diary says soil. But what is your soil is it a sphagnum peat moss/coco/perlite mix? To me you appear to be in a soilless mix. But your diary isn’t very clear on what your “soil” actually is. Or is it an actual organic living soil? Because the way you water these plants depends on the substrate too. I say this because I was sold a soilless mix and it took me a while after starting to have problems that I realized my substrate is considered soilless. I assumed I had organic soil. I had been following an organic soil regimen at a soil PH level which isn’t in the optimal range for soilless mixes. So yeah any if you’ve got more questions DM me anytime 🤙

As Papa_T said, its time relocate in to a larger pot. Rule of thumb is one your leaves extend beyond the edges of ur pot its time to transplant. I personally let them grow about an inch beyond the rim of the container. You can move right up to a 5 gallon pot and should be good to go for the rest of your grow.