Sounds like you have a couple issues.
First, if the gauge reads FULL when the actual content is much lower, then the gauge has become jammed. It is an easy fix. The gauge is mounted in the top of the toilet with a black rubber collar. This collar is a press-fit into the opening. Pry gently under the edge of the collar with a non-marring screwdriver, plastic putty knife, or whatever, and the gauge will pop up and out. In the center of the gauge assembly is a spiral strip of metal, with a float riding on it. Either the strip or the float has gotten gunked up, so clean it under a garden hose and press it back in place. Incidentally, this problem will quite often clear itself as you drive down the road with liquid in the tank. The sloshing removes the junk.
It is possible that the strip has gotten bent somehow, in which case it will jam the float. If that has happened, you will need to straighten the strip with your fingers until the float moves freely.
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I suspected that the toilet or the pipe from the toilet has a slight leak.
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Do mean that the toilet is leaking into the drain pipe, and the liquid is building up behind the outside dump valve? If so, the toilet's Slide-EZ valve (which you activate with the white handle near the floor) has developed a leak, and one of the gaskets in the assembly needs to be replaced. You can buy a kit with new gaskets, or you can buy a complete Slide-EZ valve. Both options are outlined in some of the posts you read. An annoying and somewhat time-consuming job, but not difficult.
Or do you mean that the toilet is leaking onto the floor of the bathroom? In this case, you need to replace the "foam donut" that forms the seal between the toilet and the big dump pipe below the trailer. The foam donut is available at any RV service place, but it is different from the donut seal (aka wax ring) used in home toilets, so do not buy what they have in a big box store.
There is some potentially helpful information in the TM Technical Library here, but you should do a Search to find many other posts on the topic.
https://www.trailmanorowners.com/for...ghlight=toilet
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when I came back in the toiled still read as full and has enough liquid to recirculate
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After you pull the handle and drain the toilet, I'm not sure how it could retain enough liquid to recirculate. You will probably have to remove the top of the toilet (the part containing the seat) so you can see inside the tank and see what is going on. Removing the top of the toilet is easy. It is held on with four Phillips-head screws. Two are easily visible from above, but the other two are inserted in an upward direction, and so are not visible until you get your face down near the floor and look upward. After you pull off the top, you will see a conical wire screen set in the center of the tank. The cone is not symmetrical, so if/when you remove it, be sure you remember which end goes toward the front.
Bill