Memory Leaks on GTX 1650

Hi, just wondering why the issue below happened?
it seems like after few mins the shaders happen to be lowered down to low graphic for no reason leads to this issue
the mem shown in game is 2.8gb, but somehow maned to be 7gb in task manager.

anyway to fix it?

[DISPLAY]
use_dynamic_resolution=false
water_detail=0
background_framerate_limit_enabled=false
time_manipulation_effects=true
vsync=Off
upscale_quality=Balanced
quality=true
renderer_type=Vulkan
camera_zrotation=true
shadow_type=Low
scene_brightness=0.99
screenspace_effects_resolution=0
borderless_windowed_fullscreen=true
maximize_window=false
upscale_resolution=Quality
light_quality=0
use_dynamic_particle_culling2=true
upscale_sharpness=0.4
upscale=NIS
background_framerate_limit=30
adapter_name=NVIDIA GeForce GTX 1650 - Generic PnP Monitor
resolution_width=1920
framerate_limit=240
hdr=false
bloom_strength=0.25
reflex_mode=LowLatency
adapter_uid=00000000-000145cd-00
screen_shake_v2=true
fullscreen=false
resolution_height=1080
upscale_quality_xess=Performance
framerate_limit_enabled=false
screenspace_effects=1
texture_filtering=1
dynamic_resolution_fps=120
texture_quality=TextureQualityLow
global_illumination_detail=0
ui_brigthness=0.981
triple_buffering=false