Maks Chmerkovskiy skippedDWTSperformance due to 'big chemistry issue' with partner Vanessa Lachey: Source

Its only week 3, but the drama has already begun onDancing with the Stars.

However, sources confirm to PEOPLE that Chmerkovskiy did not perform by choice because of ongoing conflict withLachey.

Theres a big chemistry issue, the insider says.

They both have big personalities and thats not always the best recipe for a good partnership.

(Reps for Chmerkovskiy and Lachey could not immediately be reached for comment.)

This isnt the first time Chmerkovskiy, 37, hasbutted headswith hisDWTScelebrity counterparts.

I feel that I can really be myself with Maks, shetoldPEOPLE in 2014.

He pushes me to stand up for myself, whether its in real life or on the dance floor.

He added at the time, She lets me be creative.

Ive already done more on this season than Ive done onDancing with the Starsin 13 seasons.

Andrews, now 39, has also raved abouther experience working withthenew dadon season 10.

However, aDWTSrep says Chmerkovskiywillcompete next week.

Dancing with the Starsairs Mondays at 8 p.m.

This article originally appeared onPEOPLE.com.