引用自 Indy11：

If I click on tech 5 to see what's available...will that reset any progress if I'm building a tech 4 experimental?

You've probably tried it by now, but yes. At least, every time I do it, it gets reset.

That explains it. I just read over it, and the two relevant FAQ's were the following.

"Why can't I queue up build orders when changing tier levels?"

The Tier buttons disable/enable buildable units to make room on the UI, this is the only possible way to make more room.


"Changing Tier cancel build orders."

Yes as stated above the units added to build queue are no longer made available to the unit to build so the orders are dropped.
A safeguard will be added to stop people killing there build orders if the builder/factory is busy.

Hey, I recently got my game kicking too, but I've had that issue as well. One thing I did in fact notice, and should be reported as a bug. If you're building a unit of say "Tech 3" and then you switch to another tech level (Ex. Tech 1 or Tech 2, from Tech 3), it resets the build order. So, in other words, you can only build one kind of tech in a factory until that build order is complete.

So what you probably did was set up a build order of one tech (Tech 4 or 5), then switched to build an experimental from the other tech level, hence why it reset it.