Possibly. It could be a polarity issue, it could be a time issue, it could be some other issue.
I would check the following in order
1) The polarity are all wired the same and the dsp settings are all the same
2) the time alignment settings are correct for each
3) You have followed a house curve and have 24db/oct slopes on the mids and the subs at the same frequency. (it doesn't appear this is followed very well yet)
If all of those are correct and you still have that phase issue I would then try the following
1) Depending on the dsp, you could do input FR viewing and see what is happening on the input side of things. May be a factory all pass filter in place.
2) Try flipping polarity of one driver at a time and seeing if it improves
3) try changing time alignment ever so slightly (dangerous game here without being able to measure phase)
4) Try adding an all pass filter on one of the drivers at 230hz and see what happens there.