I've noticed the same! It really depends on the stock, liquidity at that moment, etc. @Lee W knows how to display regulatory fees separate from the Comm/Fee in the IB report. I believe you need to create a custom report.
Examples from Friday:
GSK bought 200, Comm+Fee: 0.74, per Share = 0.0037
MU bought 400, Comm+Fee: 1.47, per Share = 0.0037
SKX bought 400, Comm+Fee: 2.32, per Share = 0.0058
SKX sell 133, Comm+Fee: 0.54, per Share = 0.0041