Have some problems with the connection

er707-m2 to sg3428x by cat8 with sfp module.

tested sfp in pc speed works. up and down.
when i add the sfp module to the switch speed go's to 600/700mb upload max, download is good.

some help

er707-m2 v1         1.2.2
sg3428x   v.13      1.30.0
oc200
2xEAP245 v4.0    1.3.0
SFP+ module TL-SM5310-T

Odido ISP Ont 1,2.5,5/10g out to ER707-M2 Wan cat8
er707-m2 Wan 2,5Ghz cat8 rj45
                 Wan/Lan2 cat8 rj45 to sg3428x sfp port1/25
sfp port1/25 sfp+ module to rj45 speeds : 1, 2.5, 5, 10g to ER707-M2 2,5ghz Wan/Lan2 
sfp port2/26 gaming pc/video intel x520-m2
sfp port3/27 truenas server. intel x520-m2