When you combine indicators on one sub-chart, it *tries* to find a scale that fits them all. If the scales are wildly different, then it can't, and plots the values of each scale separately. If it is two scales that are separate, then the first one's ticks are on the right and second one's are on the left. When it is three scales, it is right, left, right....
What you *could* do is grab the X scale with your mouse and move your mouse right a bit - that would create some empty space on the right of the chart that would make the scale numbers not obscure the lines.
The box you're talking about - Settings / Charts / General, in the Tracing section, "Show X/Y values" - wouldn't that turn it off?