Originally Posted by
cyclingman1
...I'm assuming they used the correct derailleur. I'm puzzled by this. Never had a front derailleur that could not be adjusted in over 40 yrs of cycling.
Might be a bad assumption. Is the derailleur suitable for the crankset's number of teeth on each chainring? The indenations must line up with the chain positions within fairly close limits. If there is too great a difference what you are describing is likely to occur. The derailleur cage must also be parallel with the chainrings, also within pretty close tolerance. All of these things are a lot more finicky with 11 speeds than with earlier 10-9-8-7 speed parts.