I use ToonHUD but I have never enable transparent viewmodels.

Nope. This is my AutoExec config.

m_customaccel_exponent 0
m_customaccel_max 0
m_customaccel_scale 0
m_filter 0
m_forward 1
m_mouseaccel1 0
m_mouseaccel2 0
m_mousespeed 1
m_customaccel 0
fov_desired 90
sensitivity 2.7128
crosshair 0
tf_dingalingaling "1"
tf_dingaling_pitchmaxdmg "66"
tf_dingaling_pitchmindmg "133"
tf_dingaling_volume "1"
cl_autoreload 1
hud_combattext_batching 1
r_fastzreject -1
mat_vsync 0
mat_forcehardwaresync 0
mat_levelflush 1
mat_queue_mode 2
cl_threaded_bone_setup 1
cl_threaded_client_leaf_system 0
r_queued_decals 0
r_queued_post_processing 1
r_threaded_client_shadow_manager 1
r_threaded_particles 1
r_threaded_renderables 1
net_queue_trace 0
cl_localnetworkbackdoor 1
cl_cloud_settings 0
cl_notifications_show_ingame 0
sys_minidumpspewlines 500
cl_loadondemand_default 0
cl_forcepreload 1
cl_ask_blacklist_opt_out "1"
cl_ask_favorite_opt_out "1"
sb_dontshow_maxplayer_warning "1"
tf_explanations_backpackpanel "1"
tf_explanations_charinfo_armory_panel "1"
tf_explanations_charinfopanel "1"
tf_explanations_craftingpanel "1"
tf_explanations_discardpanel "1"
tf_explanations_store "1"
tf_training_has_prompted_for_forums "1"
tf_training_has_prompted_for_loadout "1"
tf_training_has_prompted_for_offline_practice "1"
tf_training_has_prompted_for_options "1"
tf_training_has_prompted_for_training "1"
hud_fastswitch 1
sv_forcepreload 1
cl_showfps 0
fps_max 0
cl_cmdrate 67
cl_interp .033
cl_interp_ratio 1
cl_lagcompensation 1
cl_pred_optimize 2
cl_smooth 0
cl_smoothtime 0.01
cl_updaterate 67
rate 60000

https://imgur.com/p7qfYUy

Anyone know what is causing this?