Why does the cost, per unit, of engine increase on redesign?

[Kanaric]

I designed an engine and wanted to make another engine based on it immediately (no variables have changed) and when I hit redesign the cost is over $200 more expensive per unit. Is there any reason why this is? Like should I be designing engines from scratch each and every time? It seems that's what the implication is.

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I designed an engine and wanted to make another engine based on it immediately (no variables have changed) and when I hit redesign the cost is over $200 more expensive per unit. Is there any reason why this is? Like should I be designing engines from scratch each and every time? It seems that's what the implication is.

The power figures are different as well. Something must be changing on the redesign

[Eric.B]

Was this during the same turn? Or has time passed?
Are all the components exactly the same?

If it's the same turn, then it is a bug. If time has passed then there are many reasons why it has changed.

[Shepherd]

There is also another bug/exploit. Every time you enter R&D screen (same turn) from the office, R&D cost change. Both up and down.

[Eric.B]

There is also another bug/exploit. Every time you enter R&D screen (same turn) from the office, R&D cost change. Both up and down.

This is not a bug, as there is a random element to the reported costs based on your design skill (The higher your skill the less range this random value has.)

I will however it move the generation of this value from entering RnD to end turn so that you will not notice this amount changing every time you enter RnD.