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My guess is there is some kind of static state in the code being tested or in the test itself, so the tests aren't isolated. Adding the test changes the test order. In any case, your best course of action is to use the debugger to see why the tests fail.
Check your assert declaration and the method implementation with the condition.
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java.lang.AssertionError: No error should have been thrown, but ConsumeThread-2 completed error expected null, but was:<java.util.concurrent.ExecutionException: com.hazelcast.ringbuffer.StaleSequenceException: sequence:43046 is too small. The current headSequence is:43095 tailSequence is:43094>