user12506: My workflow:

Record footage on iPhone
Copy to Mac
Add to Adobe Premiere
When dragging iPhone clips "change sequence settings"
Edit / Cut / Transitions / all that fancy stuff
Nest clips
Speed / Duration to something "instagram-able" (say 25 seconds)
Speed keyframes so initially and on exit it's in real-life speed
Add some music
Export media as QuickTime (.mov) so that later I can synchronise with iPhone
Set maximum bitrate to something really big (30Mbps) so that quality is preserved
Post to Instagram (1 hour of effort for each post)

Now...

What am I doing wrong?
What switch / option / settings / preferences would allow me to avoid... (see image above for a still frame)

user17029: Looks like you have interlaced turned on. Try a different method of frame blending 

12506: <p>My workflow:</p>

<ol>
<li>Record footage on iPhone</li>
<li>Copy to Mac</li>
<li>Add to Adobe Premiere</li>
<li>When dragging iPhone clips "change sequence settings"</li>
<li>Edit / Cut / Transitions / all that fancy stuff</li>
<li>Nest clips</li>
<li>Speed / Duration to something "instagram-able" (say 25 seconds)</li>
<li>Speed keyframes so initially and on exit it's in real-life speed</li>
<li>Add some music</li>
<li>Export media as QuickTime (.mov) so that later I can synchronise with iPhone</li>
<li>Set maximum bitrate to something really big (30Mbps) so that quality is preserved</li>
<li>Post to Instagram <em>(1 hour of effort for each post)</em></li>
</ol>

<h2>Now...</h2>

<p><a href="https://i.stack.imgur.com/zTfxK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zTfxK.png" alt="enter image description here"></a></p>

<p><strong>What am I doing wrong?</strong></p>

<p>What switch / option / settings / preferences would allow me to avoid... <em>(see image above for a still frame)</em></p>
 17029: <p>Looks like you have interlaced turned on. Try a different method of frame blending </p>
