I wanted to know if there is any contradiction when someone is learning several different instruments?

For example, I am learning to play piano . Would becoming a good piano player in any way hold me back from playing another instrument professionally?

P.S. Sorry i couldn't explain well
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One of the more dangerous combinations is piano and piano accordion. The similarity of the keyboard leads to a conflation of technique that results in "lowest common denominator" approaches.

The piano is a percussive string instrument featuring impetus-sensitive attack and rather fuzzy decay, the accordion is a continuous-tone wind instrument with an attack basically insensitive to key impulse and a very precise key release imprint that, through bellows inertia, also impacts the strength of the next attack, making leggiero articulation the core of fast play, and continuous bellows control the core of slow emotional play. You would not expect to change from hurdygurdy to violin without significant investment in bow technique, either...

In this case it is more the "similarity" of the controllers that is masking core differences. In a similar vein, few people are renowned for *both* piano and organ playing skills, even though harpsichord and organ is not all that uncommon as combination.

So when going for multiple instruments, it might be prudent to pick something which significantly differs in its controls. That way, you are less tempted to skip over basics that may make a difference in why people would rather hear you play a *real* instrument than a keyboard controller with sampled sounds of it.
Don't construct excuses. With the possible exception of some atheletic pursuits, where over-development of one set of muscles might hinder other requirements - a body-builder is probably not suited to the pole-vault for instance - getting good at one thing is very unlikely to prevent you from getting good at another. Of course, if you're aiming for virtuoso level with 8 hours of daily practice on piano or violin, you might run into a scheduling problem.