There is definitely a possibility that this could happen. But through the use of mixing your coins with chips you are significantly reducing the risk of this happening. There is very little chance anyone can just look at blockchain records and figure out that this chip belonged to you, and is cashed out to x address. There is even less chance of you being accused of using other people's dirty funds when you use chipmixer.

Even if you do find yourself receiving someone else's "dirty" mixed coins, it's not your fault. You can easily prove that your coins were mixed(chips come in regular sizes, makes this easier to prove as well).

In the end, almost all bitcoins can be traced to "dirty" activity. There is really no clean bitcoin if you think about it. If you receive a bitcoin transaction from someone there is probably just as much a probability that the coins are "dirty", and it'll be easier to trace than if you used a mixer.