Polymarket vs Predictit Discrepency POTUS

Apologies if this has already been answered but I looked around and I couldn't find the answer.

Does anyone one know what accounts for the large discrepancy between POTUS winner between polymarket and predictit?

At the time of this posting polymarket has 52/46 in favor of Trump and predictit has 54/48 in favor of Harris. Is the limit on betting in predictit causing this?