I think you must have lost a spacer washer or two when putting the linkage arms back on/together. We have had enough of them apart that we make a picture of all the arms and write down how many washers at every spot then adjust as needed when it is all back together and snugged up.
The other thing i have seen is guys will put one side together with sieve assembly forward,center or rear in its stroke and something moves and the other side goes together in a different position. This twists the rails as they move . If one side was center and other was fwd or rear you may nor notice a big dif but it may rub. Always have it centered in its stroke when putting arms back together.