Jack's response is the best regarding advice- do NOT IGNORE THIS ISSUE. Doing so will worsen and weaken the horizontal frame, which is only 2x2 wood covered in thin sheet metal.
When I noticed this issue on my 1994 21' Fulkite, I repaired as follows:
Spend $1.00 at local Habitat For Humanity for a twin bed metal frame.
Cut sections of frame approximately 3-4" long, pre-drill holes (I used 1/4") at each outboard end and 1 in center for cable bolt to secure through, back into its original hole in horizontal frame.
Lift top, place 4 equal length 4x4 under each cornet of top, lower top until resting. I actually used 6 with 2 at each midpoint because I was paranoid.
Loosen cables one at a time until repairs are done, keeping 3 secured at all times.
Place "L" section of bedframe "reinforcement" along UNDERSIDE and INSIDE of top's horizontal frame, align center hole for cable bolt, and bolt (I used new replacement bolts for the originals, .12 cents each at Ace Hardware) through the other 2 holes into horizontal frame.
Reposition cable eyelet, replace bolt through eyelet into hole.
Repeat at other 3 corners, again 1 AT A TIME.
Essentially you're now done but note 2 factors: 1) This procedure actually forces the cable to run at more of a 90 degree angle rather than a "straight line" as it was prior to procedure because it was cutting/ gouging deeply into wood frame, and 2) because of this, the top will actually RAISE a small amount (mine was 1/2 to 5/8 inch) at each corner. I had to LOOSEN the adjusting bolt for 1 corner to allow for re-attachment. I knew the top was not perfectly square all around, and that 1 corner proved it.
Lift top, remove 4x4 supports, lower and lift carefully and slowly a few times to ensure proper operation.
Breathe easier knowing this was a good solid helpful- and necessary repair.
Open cold beer, admire work, consume beer then show wife and ensure her the top will NOT drop on her head in the middle of the night while sleeping.
* I neglected to take photos of this process but remember it clearly last fall before Labor day 2-week trip through 4 states, 2000 miles. Wife never once got her noggin bonked and let me have a couple more beers...