Hello,

You don't have to worry as you admit card will surely be issued. What happens is that the signature that image that is uploaded while filling the application for has very less unit of data and memory measurement and hence when we take print of it then it automatically becomes very small. If there was any issue with your signature then it would have never been uploaded and further if there will be any discrepancy in the image then you will get mail and option to reupload.

I hope this helps.