Mount descends/ascends while moving after interacting with objects above/below you

Time: June 26, 2017 3:50 AM US Eastern Daylight Time (GMT/UTC -0400)
Frequency: Always
World name: Faerie
Character name: Ryto Forastyr
Retainer name: None
NPC name: Muna Vanu
Monster name: None
Class/Level: White Mage / 66
Party or solo: Solo
In-game time: 12:10 AM
Area and coordinates: Abalathia's Spine > The Sea of Clouds > The Blue Window > X: 13.0 Y: 10.3 Z: 2.0
Housing: None
Steps:
1. Ensure you have access to Heavensward areas.
2. Unlock the Vanu Vanu Beast Tribe Quests (Heavensward content, 3.1).
3. Travel to Ok' Gundu Nakki in The Sea of Clouds.
4. Accept any Vanu Vanu quest that requires use of the sanuwa's (the Vanu Vanu's signature flying mount) Buffet ability (e.g., "Endymion Disco", "Sanuwa Samba", "Chigoe Cha-Cha", "Reeling in the Vundu", "Flight of the Midges", or "Vanish, Vile Vundu").
5. Travel via sanuwa to a quest destination.
6. Position yourself above (or below) the quest target.
7. Use the sanuwa's Buffet ability on the target.
8. Try to move forward (in a default keybinding setup, press the W key or the R key).
Your mount's flight should now be altered such that when you fly forward and downward, or upward, instead of just forward. If you were facing up at your target when you used Buffet, you will fly forward and upward. If you were facing down at your target when you used Buffet, you will fly forward and downward.
9. You can "reset" this behavior by landing your mount on solid ground, and then taking off again.

Please note, this behavior also occurs with other flying mounts, not just sanuwa; the sanuwa was simply the easiest mount to use as an example. This behavior also occurs when interacting with objects or characters while on flying mounts underwater (in Stormblood areas), with the exception that Step 9 ("reset") does not seem to work underwater. I have also replicated this behavior on multiple Windows PCs running different versions of Windows. I have been able to replicate this behavior in both Heavensward (3.x) and Stormblood (4.x) as they were current (from June 2015 to June 2017).

If additional information is required, please feel free to let me know, and I will gladly perform additional testing or provide additional information as needed to resolve this issue.


Connection Specs
- Type of internet connection/provider: CATV / Comcast Cable
- Modem maker/model number: ARRIS / SB6141

■ PC Specs

-=-=-=-=- System Information -=-=-=-=-

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SYSTEM_GRAPHICS NVIDIA GeForce GTX 970
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SYSTEM_SOUND Realtek Digital Output (Realtek High Definition Audio)
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SYSTEM_SOUND_DRIVER_VERSION 6.00.0001.7246
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SYSTEM_SOUND Realtek HDMI Output (Realtek High Definition Audio)
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Browser Information
- Name and version of the browser currently in-use: Google Chrome Version 58.0.3029.110 (64-bit)
- Internet Explorer Version: 11.0.9600.18697

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