Hi
Yes, the border of the county boundary is very confusing.
Wilnecote is now in Staffordshire, it was absorbed, along with a few other villages in the 1960s.
At one time Tamworth was divided between the two counties and had two town halls.
The parish records for Wilnecote are now housed at Stafford RO, also now available on Findmypast under the Staffordshire collections, but some records like land tax and some quarter session records are still deposited at Warwick RO.
And just to confuse matters even further, you even even find that later BMD records for Wilnecote are listed against Sutton Coldfield rather than Tamworth.
Regards
Ellen