Two Paramount+'s ?

I have Paramount + on my regular Xfinity bill for $12.99/month. We get some shows and movies on it but could never get Paramount+ series Landman and Tulsi King.  Out of frustration I went to ParamountPlus.com and signed up there for $12.99/month on my Amex card. So now I have two Paramount+'s.  OK.  But the one direct from Paramount is not available on the "Xfintiy" button my remote so I have to get to it through voice recognition on the remote. OK, but when I start watching Landman or Tulsi King I have to start at Season 1 Ep1.  And it's VERY slow and keeps stopping and re-starting. Actually not watchable. Why is all of this?