Sounds all pretty normal for an older tilt - On my 101 on the drivers side the canvas does sit in its slot behind the driver door but not on the passenger side but then I do not sit over that side
.
All I can suggest is keep the tilt on the vehicle and keep all the ropes pulled tight. In summer I have the sides of my tilt rolled up and when autumn comes along and I roll them down everything is a bit short or tight but with all the ropes tight all starts to come back to its usual tight state after a week or so.
Cheers
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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