PG numbers don't add up?

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I try to add a data pool:

OSD_STAT USED   AVAIL TOTAL HB_PEERS            PG_SUM PRIMARY_PG_SUM 
9         1076M  930G  931G [0,1,2,3,4,5,6,7,8]    128              5 
8         1076M  930G  931G [0,1,2,3,4,5,6,7,9]    128             14 
7         1076M  930G  931G [0,1,2,3,4,5,6,8,9]    128             14 
6         1076M  930G  931G [0,1,2,3,4,5,7,8,9]    128             19 
5         1076M  930G  931G [0,1,2,3,4,6,7,8,9]    128             15 
4         1076M  930G  931G [0,1,2,3,5,6,7,8,9]    128             17 
0         1076M  930G  931G [1,2,3,4,5,6,7,8,9]    128             16 
1         1076M  930G  931G [0,2,3,4,5,6,7,8,9]    128              8 
2         1076M  930G  931G [0,1,3,4,5,6,7,8,9]    128              8 
3         1076M  930G  931G [0,1,2,4,5,6,7,8,9]    128             12 
sum      10765M 9304G 9315G     

I try to add a metadata pool:

sum 0 0 0 0 0 0 0 0 
OSD_STAT USED   AVAIL TOTAL HB_PEERS            PG_SUM PRIMARY_PG_SUM 
9         1076M  930G  931G [0,1,2,3,4,5,6,7,8]     73             73 
8         1076M  930G  931G [0,1,2,3,4,5,6,7,9]     40             40 
7         1076M  930G  931G [0,1,2,3,4,5,6,8,9]     56             56 
6         1076M  930G  931G [0,1,2,3,4,5,7,8,9]     42             42 
5         1076M  930G  931G [0,1,2,3,4,6,7,8,9]     54             54 
4         1076M  930G  931G [0,1,2,3,5,6,7,8,9]     59             59 
0         1076M  930G  931G [1,2,3,4,5,6,7,8,9]     38             38 
1         1076M  930G  931G [0,2,3,4,5,6,7,8,9]     57             57 
2         1076M  930G  931G [0,1,3,4,5,6,7,8,9]     45             45 
3         1076M  930G  931G [0,1,2,4,5,6,7,8,9]     48             48 
sum      10766M 9304G 9315G   

I try to add both pools:
Error ERANGE:  pg_num 128 size 10 would mean 2816 total pgs, which exceeds max 2000 (mon_max_pg_per_osd 200 * num_in_osds 10)

That's over a thousand more PGs than both pools combined. Where are they coming from?
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