Why is M53 motorway showing 50mph speed limit southbound and 70 mph northbound'

MallyGo Registered Users Posts: 2
New Seeker
edited June 2021 in Map quality
M53 is shown as having 50mph speed limit southbound between junction 10 and where the motorway becomes the A55 when clearly it should be 70mph, Speed limit reverts to 70mph at this point. Northbound on the same part the the road is OK.
Also why are so many 20mph limits shown as 30mph. Given that this is one of the latest sat navs, one could suspect that it is not fit for purpose