Replaced and seated LCD & Touch Screen, now it looks wet?

I'm having an issue with an HTC Sensation a customer brought into me. Their LCD and touch screen were both badly damaged. Got the parts in, replaced them and seated them down properly. Only problem is when we go to use the phone the screen where we touched it looks like there's water under the touch screen. We've wiped both the LCD and touch screen a bunch of times and can't figure it out. No damage to the LCD or anything like that. What gives?

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