Viviactive 3 screen distortion

Evening all

new to Garmin after thinking of venture away from Apple for tracking activities 

so, being unsure I have brought a used vivoactice 3. Great condition so looks like it's been looked after. But on turning it on today, I noticed the screen is distorted. It might not affect the tracking but given a watch, sports watch or not, should still be able to tell the time! 
so looking at the image attached has anyone had this issue before? 
I do have the option to send it back but before I do I thought I'd pose the question! 
thanks in advance!