# Data added via web call to Databin not shown on subsequent Plot

I'm having a strange problem with adding data to a Databin.

I have a simple dataset which I've added to directly via Mathematica in a notebook, the first of the 3 rows of the table were added in this way. The 4th row was added via a https call (I have tried via a browser and via the command line with curl). Both methods of https call were successful and the data was added correctly.

RMSD    RunDate    Timestamp
10.1    20170227   2/2017 5:38 pm
4.1     20170228   2/2017 5:38 pm
8.1     20170301   2/2017 5:38 pm
4.3     20170305   2/2017 5:40 pm


When I try to plot the data, I've tried as a BarChart showing RMSD over the 4 days and with a DateListPlot showing RunDate against RMSD, the 4th row isn't shown. The data is clearly there, I can see it in the table and when I examine it in the DataDrop admin panel, but cannot be plotted.

Here's my DateListPlot code, where bin is my Databin (previously defined). The chart only shows 3 points for Feb 27, 28 and Mar 01.

ds = Dataset[bin[All, {"RunDate", "RMSD"}]];
DateListPlot[ds[All, {"RunDate", "RMSD"}]]


Has anyone noticed this before, or any idea why it's happening? I'm completely stumped!

DatabinAdd[
bin, <|"ID" -> 17,
"SecondID" -> 51, "RMSD" -> 10.1, "Integrate" -> 99.9,
"RunDate" -> "20170227"|>];


The fourth row was added via a http call like this,

https://datadrop.wolframcloud.com/api/v1.0/Add?bin=MYBINID&ID=17&SecondID=51&RMSD=4.3&Integrate=98.1&RunDate=20170305


It should be pretty easy to duplicate.