Been there, done that.
Pat’s eliminates the swivel ball that is part of your lift arm. As your 3 point hitch raises or lowers, the Pat’s hitch, that may be at a right angle to the implement’s pin at a one height, needs to swivel on the lift arm. However, if you tightened down the side adjustment bolts on the Pats, this puts tremendous force on them as they try to resist this movement.
Basically, when the bolts are tight, the function of the swivel ball is eliminated and you’re trying to compensate for the “swivel” by having the attachment’s pin swivel in the Pat’s hook (if that makes sense). This is why the bolts bend.
IMHO - THERE’S NO NEED TO TIGHTEN DOWN THE BOLTS to prevent sideways “swivel” of the Pat’s in the lift arm ball. Let the Pat’s hitch move side to side in the lift arm’s swivel ball so that it can stay perpendicular to the attachment’s lift pins over the full lift range.
Also, use the strongest grade bolt instead of the ones supplied by Pat’s. Although, they may be suppling a heavier grade than previously.