Hi Dreamer,
I think many quilters make this mistake.....
When you sew on sashings or borders...you should always measure them and cut them all the same ..and pin them to make them fit...start from the middle and work your way out.
Then sew.
When you just line them up you will get mismatched ends...and it creates excess for your LAQ. Common mistake..no worries... at this point just even up your ends by cutting them to the shortest length. You may have to have help with this. HMMMM.