With that info, I wonder why cranes collapse unless one has rigging or footing failure.
Chart will change as you boom up and down, and will also change with boom configurations.
Simple rotation- chart will stay the same, as the radius doesn't change, so the chart is the same. The liebherr is a 360 degree chart, so chart doesn't change with swing.
Typical collapse is gross overloading, and like you state, rigging or poor ground conditions. Most I see - involve a sudden change in weight- demolition- tear down of industrial equipment, and tree work.
Tilt up walls get a few cranes a year- the panels are heavy and gain weight as you stand them, and its always newly disturbed ground (soft).
The wind farms usually claim a few 500+ ton crawlers a year, bad ground between sites usually results in them going over.
Its possible also to get in trouble with telling the computer you have more counterweight hanging, when the weights are still on the trailer.
The weight shown as lifted, will change a little even with a unchanging weight. It will read a little more when you start booming up, and will get a slight decrease when booming down. You can also see a little change by simply lining up or down, but it will usually settle out when you stop moving.
It takes quite a bit of boom up, to lift the engine off the tracks, it deflects the boom and flexes the carrier enough that it would easily get a foot or two of radius if you just winched up on the load. With a lot of boom out at big radius, its not unusual to get 4-6' of radius change in simple boom deflection.
