Hi kimberley3940,
It may be that the tablet’s digitzer (touchscreen) flex cable connection is loose or that the digitizer is faulty and needs to be replaced.
Here’s a link to a [https://www.youtube.com/watch?v=aJM6eCCU0fw|video] that shows how to replace the digitizer in your model tablet, which should help you to check the cable connection and if necessary replace the digitizer.
Here’s a link to just one [https://www.ebay.com.au/i/302636266415?chn=ps&norover=1&mkevt=1&mkrid=705-139619-5960-0&mkcid=2&itemid=302636266415&targetid=538829665362&device=c&mktype=pla&googleloc=9070529&poi=&campaignid=1669165655&mkgroupid=68573517270&rlsatarget=pla-538829665362&abcId=578876&merchantid=7364522&gclid=EAIaIQobChMIz6jMsdap5AIVzoBwCh0GMgFYEAQYAiABEgKlifD_BwE|supplier] of the part. It is only shown to give you an idea of what it looks like and the cost of the part.
There are other suppliers online that may suit you better. Just search for ''RCT6773W22 touchscreen'' to get results.