That's apparently a wrong bid price on the MT4 server. Zorro does not use the spread from MT4. It gets ask and bid. The spread is the difference.

Contact your broker and inform them about the issue. Check also what spread you have in your asset list. If ask or bid are unavailable from MT4, Zorro uses the spread value from the list, so the error might also lie there.

If you get no sufficient solution from your broker, contact Zorro support. The will then send you a script for taking a snapshot from the MT4 asset parameters, to help your broker fixing the issue. It is rare, but happens occasionally that a MT4 server is wrongly configured.