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genete:

Although there are not many layers or Value Nodes that uses integers as Parameter of sub Parameter, the integer valuenode does incorrectly the interpolation.

To understand what is happening do the following:

1. Create a new document and set its fps to be 10 (10 frames per second)
2. Create any layer (a circle for example)
3. Select any parameter and convert it to Random. For example the circle's Radius.
4. Expand the Random Value Node and find the Seed sub parameter it is an integer.
5. Enter in animation mode.
6. At frame 0f edit the Seed sub parameter and set it to be 0
7. At frame 3s (or 30f at 10 fps) set it to be 30
8. Now select the Seed sub parameter and watch the curve produced in the graph panel. It is a step curve (it is integer) as it is supposed to be but the step is 3 units of eight!. There is not reason to make it by each three steps (because it there are 30 frames for a variation of 30 units so there it room for intermediate steps.

It is a bug.

Attached is a sample file. It has two circles, one showing the problem (Integer interpolation) and other showing the correct behavior after convert the integer value to scale and set the link to be 1 and the scalar to be interpolated from 0 to 30)