Question / Help Output problem

[Amtemeri]

There's this weird visual... thing (I have no clue what to call it).
https://gyazo.com/72b440ca6a3a565f91c97c96caf78e9b

My Recording output settings are:
Format: MP4
Encoder: NVIDIA NVENCH H.264 (new)
Rate Control: CBR
Bitrate: 5000 Kbps
Keyframe Interval: 0
Preset: Max Quality
Profile: high
Look-ahead: no
Psycho Visual Tuning: yes
GPU: 0
Max B-Frames: 2


My specs are:
Quadro K3100M
Intel Core i7-4910MQ CPU (8 cores)
15.17 GB RAM
1920x1080 60Hz