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Storage tank shows different values when opening it (25k) and in the side box (24k of 25k).

This is still the case with 2.0.14 (which fixes the "teleport a storage tank" problem).

This might be related to viewtopic.php?f=7&t=117768

I think this is just a rounding issue in the tooltip GUI.

There is more fun with storage tanks and the fluid system:

- create two tanks, fill each with a different liquid to 75% (I use an infinity pipe set to "exactly 75%" from Editor Extension). Each tank shows 19k Pipeline contents, but 18k in the side box. The real value should be 18,750 so that is probably some rounding problem:
- connect them to a fluid level indicator (https://mods.factorio.com/mod/Fluid-level-indicator). Both show 75%.

So now I have this setup:
Place a ghost pipe in the middle and have a robot connect the two fluid systems:

One of the fluid "wins". The pipeline shows "19k lubricant" and "19k water", but none of the tanks contains the water:
You can't get the water out either (this is a pump with a filter set to "water")
But you can get out the lubricant (this is a pump with a filter set to "lubricant"). If all is gone, the water suddenly reappears:
Finally, it turns out that the storage tank "lies" about its capacity. While it claims to hold only 25k of fluids, if you create the same scenario as above again
and then remove the robot generated pipe...

... then the fluid system (which consists of a tank and a single pipe, which should have 25,100 capacity) can hold 28.4k of fluid:
... which you still can't pump out.

For any interested observers, round vs floor has a bit of a contentious history (29184, 32439, 49274, 78370).

I'm not going to poke the bear on this again.

The fluid mixing stuff was a separate issue that has been fixed (the whole "extra fluids" concept was removed).