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what's the affect of XDATA space memory overlap?

what's the affect of XDATA space memory overlap?
I have 128 Kbytes of external ram so I use 17 Address buses and switch between 2 pages of ram by A17.
I use _at_ for some data that I want to fix at both pages so there are some space overlap(variables have same address but not the same page when run) and keil warn me about this.
The problem is my code doesn't work although my last version that doesn't use _at_ works well.
Can I ignore this warning? How should I do?
I don't know the problems are from my code or from this warning. I'm checking but can't find something wrong.
Thank you very much.