I measured the PLL open loop TF.

• For PLLX, UGF is 35.7kHz, and the phase margin is 27 degrees, in Fig. 1.
• For PLLY, UGF is 29.9kHz, and the phase margin is 34 degrees, in Fig. 2.

PLLX has a bit higher UGF, but both seem to be normal.