Are ETF's mispriced/prone to mispricing?

[Spook1304]

I've been trying to build a strategy between ETFs and the underlyings they track (like Brent Crude Oil vs WisdomTree Brent Crude Oil 2x ETF (LBRT))

The problem I'm facing is that the pricing on the IG charts and data is radically different to the actual pricing of the ETF (this applies to CFD, Spreadbetting, and Share accounts.)

Lets look at LBRT from the London Stock Exchange site, heres the last 6 months, daily chart:

Yesterday (21st Aug 24), from the high to the low was 1.37

 

on Hargreaves for the same date was a high to low of 1.66

But on IG's platform there is a difference of 8.74 from high to low!:

As you can see from the chart, there are insane price hikes and drops. All of the heads and tails you are seeing all happened within a second:

10sec chart

1 sec chart:

 

I have checked multiple brokers and none of them have this - this seems to happen a lot on the IG platform to many ETFs and Stocks. 

Here's a side by side example of USO ETF daily chart, left is IG, right is exchange:

I have a couple of questions, If I were in a trade and this had to happen (the price jumping sometimes in excess of 10% higher or lower in 1 second) and I had a stop in place, would this trigger my stop?

If I had a limit order there, would I actually get filled at those prices?

With the large discrepancy between the two instruments, It's hard to trust the platform. I was under the impression if it was a Share account (not spread bet or CFD) it would trade on the exchange.

Thanks.

[Spook1304]

Also, is there somewhere this data can actually be downloaded? 

 

[Spook1304]

anyone?