I have got a strange problem on a song

I have written in a 16 bar song -- chords and notation--and am using it to print notation

The thing is that every time I open the song I have bars 17 and 18 with the same chord as bar 16

I have gone to the song settings and turned off 2 bar endings and as it uses Real Tracks I have turned off --allow 4 bar endings for Real Tracks

I have the number of bars set to 16 and choruses set to 1--I have also set the loop function to off and the fake function to off

I delete bars 17 and 18 and then hit --save--so I assumed it would remove them, but every time I open the song again bars 17 and 18 are there again

I also notice that they are there when I go into notation mode although they dont print out, as I do not put any notes in them

Is this just something that is always there??

I have copied the song from another version of it that does have a 2 bar ending--is that it??

Tx

Phil