Berean Standard Bible (BSB)
Those people are zealous for you, but not in a good way. Instead, they want to isolate you from us, so that you may be zealous for them.
World English Bible (WEB)
They zealously seek you in no good way. No, they desire to alienate you, that you may seek them.
Strong's King James
They zealously affect{G2206}{(G5719)} you{G5209}, but not{G3756} well{G2573}; yea{G235}, they would{G2309}{(G5719)} exclude{G1576}{(G5658)} you{G5209}, that{G2443} ye might affect{G2206}{(G5725)} them{G846}.
The F.O.G *
(17) They are jealous of you, not for good, but rather to shut you out so that you will be zealous for them.
The F.O.G Message *
Young's Literal Translation
they are zealous for you—yet not well, but they wish to shut us out, that for them ye may be zealous;