I am not so sure about the "spiral" being intentional. But it may have been.
Some patterns, such as with this Bacchus heart pattern weight
seem to be deliberate, based on the way the canes are set within the overall design, even though parts look like just a slippage of canes.
In the Bacchus heart, note that at positions 1 and 4, the outer edge canes slip inwards. For 4, the outer cane appears to have just pushed the next row canes aside without any major affect on others. For 1, the "push" appears to continue alll the way to the centre canes, but this may have been a result of the setting of canes in the centre rather than a "push" from the edge. The central area clearly shows at 2 and 3 that there are additional canes (two at 2 and three at 3) added at those parts of the inner circle. This strongly suggests a deliberate pattern design with the line of canes from 1 simply moving in to fill the shape at the centre.
However note also that, as is often the case, different sized canes may be used in various positions and that in itself could cause a slippage in a regular concentric design. Although the eBay weight shows a similar line of "slipped" canes, as with the Bacchus, there are no addtiional canes around the centre which seems to have just parted at one position allowing outer canes to slide inwards.
But please feel free to disagree.