Possible castle bug?

Hi there, I think I have a bug with one of my castle slots.
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As you can see, to upgrade to level 1 on the slot 3 on my topcastle, it costs 337'500 P. (Half price / castle day). I know a noob question, But is this normal? For my other castle on lvl4 it costs 60'000 P. (Half Price).

omg... this is the activation price for the slot not the leveling price..

First, it's a 25% discount during castle days. Second, since you obviously didn't build this boat up yourself, it would do you well to read the Seafight Bible on the forum. Basic questions like these are answered in it, and you'll save yourself and this forum time by learning about the game. Lastly, if you didn't purchase this boat, kindly go to hell.

Cost Castles (with and without discount 25%).

Cost Slots.
1ª 0 Perlas - 0 Perlas
2ª 75.000 Pearls - 56.250 Pearls
3ª 150.000 Pearls - 112.500 Pearls
4ª 225.000 Pearls - 168.750 Pearls
5ª 300.000 Pearls - 225.000 Pearls
6ª 375.000 Pearls - 281.250 Pearls
7ª 450.000 Pearls - 337.500 Pearls
8ª 450.000 Pearls - 337.500 Pearls
9ª 450.000 Pearls - 337.500 Pearls

Cost Slots Voodoo.
1ª 0 Pearls - 0 Pearls
2ª 75.000 Pearls - 56.250 Pearls
3ª 150.000 Pearls - 112.500 Pearls
Cost Upgrade Slots.
2º 20.000 Pearls - 15.000 Pearls
3º 40.000 Pearls - 30.000 Pearls
4º 60.000 Pearls - 45.000 Pearls
5º 80.000 Pearls - 60.000 Pearls
6º 100.000 Pearls - 75.000 Pearls