Why my airlines suddenly doubled in personnel without doing anything significant?

I have recently started building an airlines in Yeouido server. However, a few days ago when I added 3 planes into my fleet and scheduled some flights, number of staffs in my was increasing from 800-something to 900-something, yet after clicking through personnel management pages without making any changes and without saving anything, the number of staff in my airlines suddenly increased to about 2100. It caused the salary I have to pay to double and make me have to cut off some planes and did a temporary route cut in order to preserve enough cash for the week end closing. Why this happened?

What staff did increase in particular? It could be that you signed a bunch of interlining agreements, causing you to need to hire more network staff for instance.

Unfortunately I didn’t check/recall the breakdown beforw this occur, but when the sitiation occurred on Oct 10 which I didn’t ahreed any interline agreement at the time. And even now that I agreed a few interline agreement on Oct 13, the total staff added according to interline summary was just about 100-200, not 1200.

No helping without seeing a current breakdown. I can’t tell you if it is ok or not if you don’t share any detail…

The current breakdown is

The breakdown actually looks completely normal to me. The reason your personnel cost increased when clicking on the page, is that that seems to refresh the cost in your upcoming cost overview, but it would get charged per that value anyway.

Probably you scheduled your flights, didnt click on personnel tab anymore until another day.

I indeed didn’t check the personnel cost until that day after I scheduled the flights so that might be the case
But that late update caused bill shock
How to avoid the situation other than periodically checking the page after adding new aircraft and schedule?

Either by having enough buffer, or indeed periodically checking.